Paper feeding mechanism



Feb.- 14, 1939.

I J. G. IERGOBBI PAPER FEEDING MECHANISM,

Filed Feb. 5, 1957 P INVENTOR an M.

Patented Fob; 14, 1939 PATENT, OFFICE 2,14%223 PAP R. FEEDING MECHANISM John G. Vcrgobbi, Quincy, Mass assignor to Pneumatic Scale Corp ration, Limited, Quincy, Mass, a corporation of Massachusetts Application February 5, 931, Serial no. 124,205 8 Claims. (ones-12) This. invention relates to paper feeding mechanism.

The invention has for one of its objects to provide. a novel and highly efficient paper feeding and gluing device for a package forming machine, and particularly a cartonv or bag forming machine which is adapted for use in the production of cartons or bags provided with paraflin coated paper liners.

A further object of the invention is to provide a novel and highly efiicient feeding mechanism for feeding paraffin coated paper.

With these general objects in view and such others as may hereinafter appear, the invention consists in the paper feeding device as embodied in a package forming machine and in the various structures, arrangements and combinations 'of parts hereinafter described and particularly defined in the claims at the end of this specification.

In the drawing a sufllcient portion of a packaging machine'embodying the invention has been illustrated as will enable the diflerent features of .the invention to be understood, wherein Fig. 1 is a diagrammatic view of the paraffin paper feeding mechanism embodied in the present machine; Fig. 2 is a detail view partly in section-of the first pair of feeding rolls of the 'paraflin paper feeding mechanism; Fig. 3 is a similar viewofthe second pair of feeding rolls; and Fig. 4 is a sheet of paraflin paper showing the location of the strips of adhesive, to be referred to.

In the packaging machine forming the subject matter of the present invention, provision is made for forming the package, such as a. carton or bag, by wrapping a sheet about a forming block IO, and for folding and sealing the bottom portions of the carton or bag. Inasmuch as the details of such bag forming and carton forming mechanism are, well-known and of themselves constitute no part of the present invention,'the forming block It has been illustrated as mounted upon the usual rotary spider l2 of-a machine of this type. when paramn paper is to be used I as the liner for a carton or bag, provision is made for feeding a. sheet of such paper to a cut-off knife to the end that an individual sheet may be formed and wrapped about the forming block ll prior to the wrapping and forming of the carton or bag upon the forming block. The present invention contemplates feeding mechanism for feeding astrip of paraiiin paper to the usual coma knife of a packaging machine of the character described to the end that successive sheets i of'the paraffin paper of-substantially equal the first set of rollers l5, 16.

may be cut 01!. Prior feeding devices of which I am aware have all been provided with metal rollers, and in attempting to use such prior feeding devices upon the paraffin coated paper substantial variations have been experienced in the 5 lengths of paraflin paper out off by the cut-off knife. This has seriously interfered 'with the successful and practical operation of the machine.

Referring now to the drawing,wherein the im- 10 proved feeding apparatus is shown in connection witha known form of bag forming or package making machine, l3 represents a roll of waxed or paraflin coated paper which is fed over an idler II and between rollers l5, It to a second 1 pair of feed rollers ll, l8. The rollers l5, l6 and the roller H are driven continuously in any usual or preferred manner through chain and sprocket drives from a continuously driven shaft,

not shown, the rollers l5, It being geared together by spur gears I9,- 20. The roller I8 is in' fric- 1 tional contact with the loosely rotatable roller l1 and is driven at a higher rate of speed than The rollers l1, l8 move'the strip of paraffin paper forward to a folding table 22, of well-known construction, below the forming block In upon which the severed sheet is to be subsequently wrapped. In order to hold the strip stationary to effect the severing of a sheet from the strip,

the usual holding fingers 25, located in advance of the rollers l1, l3, and only one of which is sho are provided. .The fingers 25 are-caused to rock at the proper time to hold the sheet between the fingers" and a shelf 26, by a cam 2'|, mounted on a cam shaft 29, through connections including a lever 3|, connecting rod 33, a two armedlever 35. the second arm 31 of which is provided with. a cam roll 39 cooperating with the cam 21. The usual spring connection, not shown,

is provided to hold the cam roll as against its cam 21. The fingers 25' and the lever 3| are formed integrally and :are loosely mounted upon the shaft ll. The holding fingers are provided with'rubber faces :0 adapted to contact with the paraffin paper-to interrupt the further feeding of the strip while a cutter 3|] in cooperation with .a stationary blade 3': operates to sever'a sheet from the strip. The cutter 30 maybe operated byany usual means. not shown, and is posiw tione'd immediately beyond the rollers l1, l8. During the cutting operation the continuously rotated roller I 3 slips over the paper while the rollers II, I continue to feed the strip which forms a slight loop as illustrated of suillcient shown in dotted lines in Fig. 1) is taken 'up so that the strip will be taut between the two sets of rollers (as shown in full lines), when the holding fingers 25 are again lowered to hold the strip for the cutting operation.

As herein shown, provision is made for raising the frictional contact rollers l1 during the time that the strip is held stationary by the hold-, ing fingers 25, in order to relieve the pressure of the rollers I! against the continuously driven roller I8, thereby eliminating the possibility of accumulating paraffin upon the roller I8 from the parafiin paper. The rollers I! are mounted upon a shaft 43 which is supported in slots 45 in bearings 41. The ends of the shaft 43 extend beyond the bearings and are engaged by lifting fingers 49 on either side. The lifting fingers 49 are secured to the shaft 4| and are rocked by 'a cam 50, mounted on the cam shaft 29, through connections including a lever 54 keyed to the rocker shaft 4|, connecting rod 56, a bell-cranky, the other arm 59 of which is provided with a cam roll 60 cooperating with the cam 50.

In practice when attempt was made to feed paraflin paper by the usual forms of paper feeding mechanism embodying steel rollers the paraffin rapidly built up on the steel feed rolls with the result that the severed sheets varied greatly in length. When embodied in a wrapping machine this defect seriously interfered with the successful operation of the machine.

In accordance with the present invention, see Fig. 2, the roller l6, which is suitably mounted in bearings 34 in the machine frame, is provided with a rubber covered surface 36 and in cooperation therewith a plurality of narrow cork covered rolls l5 are provided and as a result in the operation of the mechanism the paraffin strip is fed at a uniform rate of speed without collecting or building up paraflin from the paper passing therethrough upon any of the rollers.

Referring now to Fig. 3 the rapidly revolving roller I8 is formed in part of metal and in part of rubber, her'ein shown as rubber inserts 38. In operation the roller ill, in cooperation with the light metallic friction roller I1 is effective in feed ing the paraifin paper forward at a constant rate of speed, without slippage, when the holding fingers 25 are not in operation to the end that uniform lengths of severed sheets may be produced. On the other hand, when the holding members 25 are in contact with the paper to hold the same stationary, the roller l8 slips over the paraflin paper without interfering in any way with the subsequent feeding operation during the next cycle of the machine. In other words, the gripping characteristics of the feed rollers are such as to alternately feed the material and slip over the material without the accumulation of paraffin on the feed rollers and consequently sheets of uniform length may be produced. During the operation of the machine, the rollers I! are raised directly after the holding fingers 25 come down and are lowered again immediately preceding the releasing of the strip, when the fingers 25 are raised.

The usual adhesive applying device, generally indicated at 40, may be provided for applying adhesive to those parts of the sheet which will overlap during the subsequent folding or wrapping operation around the forming block l0 and as herein shown comprises a glue roll 42 running in a glue pan 44, in cooperation with an applying roll 46. The rolls are driven from the feed roll l6 through cooperating gears not shown.

As herein shown, see Fig. 4, the strip of paraffin paper is provided with adhesive along the longitudinal edge at 62, a short space at each end of the sheet being left without adhesive, this space corresponding to the position where the sheet is to be severed thus preventing an accumulation of glue upon the cut-off knife 30. Adhesive is also applied at 64, laterally of the sheet, of a length corresponding to onewidth and one thickness of the lining to be formed. These adhesive strips are applied by the roller 46, which is provided with the circumferential surface 56,

nite location with relation to-xthe severed sheet,

it will be seen that any variation in the rateof feed would be detrimental to the alignment of the severed sheet. An accumulation of paraffin upon the feeding rolls'would have the effect of increasing the surface speed of the feed rollers and thereby cause an incorrect length to be fed. The above described feeding mechanism permits the strip to be accurately indexed for severing successive sheets uniformly.

While the preferred embodiment of the invention has been herein illustrated and described, it will be understood that the invention may be embodied in other forms within the scope of the following claims.

Having thus described the invention, what is claimed is:

1. In mechanism for feeding paraflin paper to a cutter, in combination, a pair of continuously driven feed rolls comprising an elongated paper supporting lower roll of non-metallic material and a relatively narrow upper roll of cork, a second pair of feed rolls spaced from the first pair and comprising a driven paper supporting roll having its surface composed in part of material capable of exerting a relatively eiiicient gripping effect upon the paraffin paper and in part of a material capable of exerting a relatively inefficient gripping effect upon the paraflin paper,

of the second pair of rolls and adapted to cooperate with the paraflin paper being fed by the first pair of rolls to terminate the movement of the paraflln paper through the second pair of rolls to thereby permit the cutter to cut the paper while the latter is substantially stationary.

2. In mechanism for, feeding paraflin paper to a cutter, in combination, a pair of continuously driven feed rolls comprising an elongated paper supporting lower roll of non-metallic material and a narrow upper roll of cork, a second pair of feed rolls spaced from the first pair andcomprising a driven paper supporting roll forming the lower roll and having its surface composed in part of material capable of exerting a relatively high gripping effect upon the paraffin paper and in part of a material capable of exerting a rela-' tively low gripping effect upon the paraffin paper, a light non-driven pressure roller comprising the upper roll, and a holding device positioned in ad? 5 vance of the second pair of rolls and adapted to cooperate with the paraflin paper being fedby the first pair to terminate the movement of the 'parafiin paper through the second pair of rolls to thereby permit the cutter to cut the paper 1 while the latter is substantially stationary, means for lifting the upper of said second pair of feeding rolls when said holding device is operated, the frictional characteristics of the lower of said second pair of feeding rolls being such as to permit parafiin paper to slip between the rolls when said of exerting a relatively efiicient gripping effect upon the paraffin paper and inpart of a material capable of exerting relatively inefiicient gripping efiect upon the paraffin paper, a light upper pressure roller cooperating therewith, and a holding device positioned in advance of the second pair of rolls and adapted to cooperate with the paraflin paper being fed by the first pair of rolls to'terminate the movement of the parafiin paper through the second pair of rolls to-the'reby perrnit the cutter to cut the paper while the latter is substantially stationary.

4.- In mechanism for feeding parafiin paper to a cutter, in combination, a pair of continuously driven feed rolls comprising an elongated paper supporting lower roll having a rubber surface and a narrow upper roll oflcork, a second pair of I feed rolls spaced from the first pair and comprising a driven paper supporting roll forming the lower roll and having its surface composed in part of material capable of exerting a relative-- ly high gripping effect upon theparaifin paper and in part of a material capable of exerting a relatively low gripping effect upon the paramn paper, a light non-driven pressure roller comprising the upper roll, and a holding device-positioned inadvance of the second pair of rolls and adapted to cooperate with the paraffin paper being fed 'by the first pair to terminate the movement of the paraflin paper through the second pair of rolls to thereby permit the cutter to cut the paper while the latter is substantially stationary, means for lifting the upper roll of said second pair of feeding rolls when the holding device is operated, the frictional characteristics of the lower of said second pair of feedingrolls being such as to permit parafiin paper to slip be.- tween the rolls-when said holding device is operated and to effectively feed said paraffin paper when the holding device is inoperative and the upper roll is lowered.

5. In mechanism for applying adhesive and feeding parafiin paper to a cutter, in combination, 0 a pair of continuously driven feed rolls comprising an elongated paper supporting lower roll of non-metallic material, a plurality of spaced relatively narrow upper rolls of cork, an adhesive applying device arranged to apply adhesive to latierally spacedportions of said paraffin paper,-

cork rolls being disposed to engage portions of the paper between the applied adhesive, a second pair of feed rolls spaced from the first pair and comprising a driven paper supporting roll having its surface composed in part of material capable of exerting a relatively efllcient gripping efiect upon the paraffin paper and in part of a material capable of exerting a. relatively inefllcient gripping effect upon the paraflin paper, 'a light upper pressure roller. cooperating therewith, and a holding device positioned in advance of the second pair of rolls and adapted to cooperate with the paraffin paper being fed by the first pair of rolls to terminate the movement of the parafiln paper through the second pair of rolls to thereby permit the cutter to cut the paper while the latter is substantially stationary.

6. In mechanism for applying adhesive and feeding paraflln paper to a cutter, in combination, a pair of continuously driven feed rolls comprising an elongated paper supporting lower roll of non-metallic material, a plurality of spaced relatively narrowupper rolls of cork, an adhesive applying device arranged to apply adhesive to laterally spaced portions of said paraffin paper, said cork rolls being disposed to engage portions of the paper between the applied adhesive, a second pair of feed rolls spaced from the first pair and comprising a driven paper supporting roll forming the lower roll and having its'surface composed in part of material capable of exerting a relatively high gripping effect upon the paraffin paper and in part of a material capable of exerting a relatively low gripping effect ,upon the parafiln paper, a light non-driven pressure roller comprising the upper roll, and a holding device positioned in advance of the second pair of rolls and adapted to cooperate with the parafiin paper being fed by the first pair to terminate the movement of the paraffin paper through the second pair of rolls to thereby permit the cutter to cut the paper while the latter is substantially stationary, means for lifting the upper roll of said second pair of feeding rolls, the frictional characteristics of the lower of said second pair of feeding rolls being such as to permit parafiin pa-' per to slip between the rolls when said holding device is operated and to effectively feed said" paraffin paper when the holding device is inoperative.

.7. In mechanism for applying adhesive and feeding paramnpaper to a cutter, in combination, a pair of continuously driven feed rolls comprising an elongated paper supporting lower roll having a rubber surface, a plurality of spaced relatively narrow upper rolls of cork,.an adhesive applying device arranged to apply adhesive to laterally spaced portions of said paraflin paper, said cork rolls being disposed to engage portions of the paper between the applied adhesive, asec- 'ond pair of feed rolls spaced from the first pair and comprising a driven paper supporting roll I having its surface composed in part of material capable of exerting a relatively eflicient gripping eiIect upon the paraffin paper and in part of a material capable of exerting a relatively inefflcient gripping effect upon the paraffin paper, a

light upper pressure roller cooperating therewith,

and a holding device positioned in advance of the second pair of rolls and adapted to cooperate with the paraflin paper being fed by the first pair of rolls to terminate the movement of the paraflin paper through the second pair of rolls to thereby permit the cutter to cut the paper while the latter is substantiallystationary.

8. In mechanism for feeding parafiin paper to a cutter, in combination, a pair of continuously driven feed rolls comprising an elongated paper supporting lower roll of non-metallic material and a narrow upper roll of cork, a second pair of feed rolls spaced from the first pair and comprising a driven paper supporting roll forming the lower roll provided with a plurality of yieldable rubber inserts therein, a light non-driven pressure roll comprising the upper roll and a holding device positioned in advance of the second pair of rolls and adapted to cooperate-with the parafiin paper being fed by the first to termisaid paraflln paper when the holding device is m inoperative. I

JOHN G. VERGOBBI. 

